We have been using an HP Design Jet T2300 for several years. It doesn't get a huge amount of use but it's been reliable. We got it so we could scan old mylar prints and get rid of all the vertical files. It worked well for that.
In Reply to Tom Uminn:
We have a Canon iPF700 that we’ve been very happy with. That exact model has been discontinued, but anything in the 700 series should be comparable.